[A.A. Cunningham]

22 Churches sui juris within the Catholic Church. Greek Byzantine is one.

[kosta50]

Orthodox Churches that use the Old Calendar are Russian, Serbian, Jerusalem and monasteries on Mt. Athos. They are in full communion with the See of Constantinople. Other Orthodox Churches (Greek, Romanian, Bulgarian, Ukrainian, etc.) are also in communion with Constaninople.

Various so-called Greek Catholic churches, Uniates, are not Orthodox churches, Alexandria and similar monophysite, the Maronite Church and so on, are in communion with Rome since the 15th century (following the so-called "re-union" in Florence).

Orthodox Churches are those churches that are in communion with the See of Constantiople. Others are either heretic churches that broke off early in Christian history, or those that joined the Roman Carholic Church at a later date by accepting Latin theological innovations.